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November 20th, 2014 11:00
VMAX and vSphere 5.5 VAAI
Is there a way to prove that VMware is using VAAI on a LUN attached to a VMAX? I'm going to start using thin LUNs on the disk array but want to be absolutely sure that VMware has VAAI active on the LUN. Maybe even a command on the vSphere side.
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bhalilov1
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November 20th, 2014 12:00
From VMWARE KB "Frequently Asked Questions for vStorage APIs for Array Integration (1021976)" :
This will list all visible devices with their capabilities :
esxcli storage core device vaai status get
esxtop will show statistics for VAAI operations too. It's kinda difficult to find at first - press u for disk device, then f to select fields. The VAAI stats are not visible by default, you need to press o and p :
O: VAAISTATS= VAAI Stats
P: VAAILATSTATS/cmd = VAAI Latency Stats (ms)
seancummins
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226 Posts
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November 20th, 2014 12:00
Daniel,
A couple thoughts on how you could approach this:
- Compare the execution time for a Storage vMotion job with and without VAAI (you can disable it from the ESX host to perform the comparison). With VAAI, the Storage vMotion job should happen very quickly. Without it, all data must stream though the host, so the operation will take longer.
- I haven't done this myself, but you could also try running a Storage vMotion job and look for "Extent Based Clone" activity on the underlying SymDevs during the operation. You can see this with the "symdev -sid show " command.
For example, you could put together a quick while loop to monitor Extent Based Clones on a particular device while you're running the Storage vMotion against it:
sandy# while true; do symdev -sid 0277 show 2078 |grep -i extent; sleep 1; done
Extent Based Clone : None
Extent Based Clone : None
Extent Based Clone : None
Thanks,
- Sean
bhalilov1
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November 20th, 2014 13:00
Hi Drew,
Why there are no metrics to monitor VAAI operations with Unisphere ?
WorldPolice
123 Posts
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November 20th, 2014 13:00
Enhancement requests exist for the functionality it just has not been added to the product yet. I have no insight into a timeline, however, and potentially it may never be included.
WorldPolice
123 Posts
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November 20th, 2014 13:00
http://www.emc.com/collateral/hardware/white-papers/h8115-vmware-vstorage-vmax-wp.pdf